Make sure to unlock OMAP file when we're done writing to it #1756

Job	Run time
build	9m 6s
build-ceph	2m 1s
demo	4m 7s
pytest (cli)	2m 8s
discovery (container)	3m 59s
pytest (cli_change_lb)	2m 42s
ha (sanity)	3m 53s
discovery (embedded)	3m 43s
pytest (state)	2m 15s
ha (state_transitions)	3m 48s
pytest (multi_gateway)	2m 52s
ha (state_transitions_both_gws)	5m 17s
ha (state_transitions_loop)	12m 0s
pytest (server)	2m 32s
pytest (grpc)	2m 55s
ha (state_transitions_rand_loop)	15m 8s
pytest (omap_lock)	3m 22s
ha (late_registration)	3m 42s
ha (late_registration_loop)	15m 47s
pytest (old_omap)	2m 9s
pytest (log_files)	3m 36s
ha (4gws)	6m 13s
pytest (nsid)	3m 27s
ha (4gws_loop)	7m 4s
pytest (namespaces)	9m 1s
push-to-registry	0s
	2h 12m 47s

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